Add HSVToRGB

Source/Editor/Surface/Archetypes/Material.cs

@@ -815,6 +815,23 @@ namespace FlaxEditor.Surface.Archetypes
                     NodeElementArchetype.Factory.Output(0, string.Empty, typeof(Vector3), 1),
                 }
             },
+            new NodeArchetype
+            {
+                TypeID = 36,
+                Title = "HSVToRGB",
+                Description = "Converts a HSV value to linear RGB",
+                Flags = NodeFlags.MaterialGraph,
+                Size = new Vector2(160, 25),
+                DefaultValues = new object[]
+                {
+                    new Vector3(240, 1, 1),
+                },
+                Elements = new[]
+                {
+                    NodeElementArchetype.Factory.Input(0, "HSV", true, typeof(Vector3), 0, 0),
+                    NodeElementArchetype.Factory.Output(0, "RGB", typeof(Vector3), 1),
+                }
+            }
         };
     }
 }

Source/Engine/Tools/MaterialGenerator/MaterialGenerator.Material.cpp

@@ -458,6 +458,22 @@ void MaterialGenerator::ProcessGroupMaterial(Box* box, Node* node, Value& value)
         value = writeLocal(ValueType::Vector3, String::Format(TEXT("{1} < 1000.0f ? {0} * {1}/1000.0f : {0}"), color.Value, temperature.Value), node);
         break;
     }
+        // HSVToRGB
+    case 36:
+    {
+        const auto hsv = tryGetValue(node->GetBox(0), node->Values[0]).AsVector3();
+
+        // Normalize
+        auto color = writeLocal(ValueType::Vector3, String::Format(TEXT("float3({0}.x / 360, {0}.y, {0}.z)"), hsv.Value), node);
+
+        auto x1 = writeLocal(ValueType::Vector3, String::Format(TEXT("clamp(abs(fmod({0}.x * 6.0 + float3(0.0f, 4.0f, 2.0f), 6.0f) - 3.0f) - 1.0f, 0.0f, 1.0f)"), color.Value), node);
+        
+        // Smooth out
+        auto x2 = writeLocal(ValueType::Vector3, String::Format(TEXT("{0} * {0} * (3.0 - 2.0 * {0})"), x1.Value), node);
+        value = writeLocal(ValueType::Vector3, String::Format(TEXT("{1}.z * lerp(float3(1.0, 1.0, 1.0), {0}, {1}.y)"), x2.Value, color.Value), node);
+
+        break;
+    }
     default:
         break;
     }